Post History

### Magnets

While not exactly the same, a few years ago when I had my car towed, I saw incredible advances in technology in such a seemingly mundane activity.

* Tracking of the tow truck via GPS location on my phone until he got to my location
* Radio controlled (Zigbee? Bluetooth?) flashing lights placed on the back of my car while it was being towed
* The flashing lights placed on the back of my car while it was being towed were stuck on with a magnet

This last item, which admittedly is the least innovative (magnets are nothing new) is the relevant one here. The key is that magnets - whether in headphones, on refrigerators (I've got some super powerful ones on the refrigerator next to me that I got for [almost nothing on Amazon](https://amzn.to/3rs1uET)) or for other uses are far more powerful than they used to be. The key word is "rare earth". I don't all the physics behind them, but the bottom line is that you can get really strong magnets now for a very low price, and that's ideal for holding things - including lights - to the hood (or door or trunk) of a car.